export class CustomNgbDateParserFormatter extends NgbDateParserFormatter {

    format(date: NgbDateStruct): string {
      return date ? `${padNumber(date.month)}.${padNumber(date.day)}.${date.year}` : '';
    }

    parse(value: string): NgbDateStruct {
        if (value) {
      const dateParts = value.trim().split('.');
      if (dateParts.length === 1 && isNumber(dateParts[0])) {
        return {year: null, month: toInteger(dateParts[0]), day: null};
      } else if (dateParts.length === 2 && isNumber(dateParts[0]) && isNumber(dateParts[1])) {
        return {year: null, month: toInteger(dateParts[0]), day: toInteger(dateParts[1])};
      } else if (dateParts.length === 3 && isNumber(dateParts[0]) && isNumber(dateParts[1]) && isNumber(dateParts[2])) {
        return {year: toInteger(dateParts[2]), month: toInteger(dateParts[0]), day: toInteger(dateParts[1])};
      }
    }
    return null;
    }
}